A Cable Partial Discharge Calibration Simulation System and Method Based on Programmable Technology

Abstract

The present invention belongs to the field of calibration simulation technology, and specifically discloses a cable partial discharge calibration simulation system based on programmable technology. The system includes: a signal parameter setting module that can use a signal generator to set standard signal parameters, covering frequency, amplitude, pulse width, and repetition frequency. A signal coupling and transmission module can cause the signal generator to generate a signal and couple it to the cable. An environmental parameter acquisition module is responsible for collecting the environmental temperature, humidity, magnetic field strength, and electric field strength of the signal generator and the cable at each monitoring point. An environmental parameter correction module, based on the collected environmental data, monitors the signal parameters at each monitoring point of the cable in real time and analyzes the temperature, humidity, magnetic field, and electric field correction indexes. A signal parameter correction module corrects and analyzes the cable signal parameters accordingly. A deviation degree abnormal determination module analyzes the deviation degree index based on the standard and the corrected signal parameters, and determines whether it is abnormal for calibration.

Description

Technical Field

[0001] The present invention belongs to the technical field of calibration simulation, and relates to a cable partial discharge calibration simulation system and method based on programmable technology. Background Art

[0002] In the power system, as an important device for electric energy transmission and distribution, the stability and reliability of the operating state of the cable are crucial for the safety of the entire system. However, during operation, the cable may generate partial discharge phenomena due to various reasons, which will not only accelerate the aging of the cable insulation, reduce its service life, but also may cause serious power accidents. Therefore, it is particularly important to accurately measure and calibrate the partial discharge of the cable.

[0003] For example, Chinese invention with publication number CN112363028B discloses a calibration method for a cable for partial discharge simulation and a high-voltage cable partial discharge measurement system. The cable for partial discharge simulation includes two copper wires formed by connecting a plurality of inductors in series, and a capacitor is connected in parallel in front of each inductor at each symmetric position on the two copper wires. This cable for partial discharge simulation is based on lumped parameter electronic components. By using lumped parameter components to simulate the actual cable, a small-sized integrated module is used to replace the actual cable that occupies a large amount of space, and the advantage is more obvious when simulating partial discharge at a long-distance position. In addition, this cable for partial discharge simulation with this structure can avoid problems such as discreteness, poor repeatability and stability of parameters such as partial discharge quantity, cumulative effect of partial discharge defects, and unstable signals existing in the process of simulating partial discharge by setting physical defects based on the actual cable. The simulation effect of this cable for partial discharge simulation is real, the data is accurate, the repeatability is good, the simulation effect is good, and the implementation is convenient.

[0004] The above prior art has the following problems: 1. The prior art focuses on using lumped parameter electronic components to simulate the cable for partial discharge, and the key is to solve problems related to its own structure and simulation effect such as discrete and unstable parameter performance and unstable signals that occur when simulating based on the actual cable. However, it does not consider the influence of various environmental factors on each signal parameter during the actual operation of the cable, and there is no correction of each signal parameter based on various environmental factors. This leads to the difficulty of ensuring that each signal parameter can always be close to the ideal standard value under different actual environmental conditions, and it is unable to effectively cope with the interference brought by environmental changes to signal transmission, restricting its ability to ensure data transmission quality and reliability in complex and changeable environments.

[0005] 2. The existing technologies mainly focus on the structural design of the cable for partial discharge simulation and the simulation of the relevant characteristics of the actual cable through lumped parameter electronic components. The key lies in solving the problems in aspects such as parameter performance and simulation effect during the simulation based on the actual cable. However, it does not involve the accurate quantification of the signal deviation situation, making it difficult to accurately know how much the signal deviates from the standard state during transmission, and lacking the ability to accurately control the signal transmission. Summary of the Invention

[0006] In view of this, to solve the problems raised in the above background technology, a cable partial discharge calibration simulation system and method based on programmable technology are proposed.

[0007] The object of the present invention can be achieved through the following technical solutions: The present invention provides a cable partial discharge calibration simulation system based on programmable technology, including: A signal parameter setting module: used to set various standard signal parameters through a signal generator, including the standard frequency, standard amplitude, standard pulse width, and standard pulse repetition frequency of the signal.

[0008] A signal coupling and transmission module: used to generate a signal through a signal generator and couple and transmit the generated signal to the cable.

[0009] An environmental parameter acquisition module: used to acquire the temperature, humidity, magnetic field intensity, and electric field intensity of the environment where the signal generator and the cable are located at each set monitoring point.

[0010] An environmental parameter correction module: used to monitor in real time the various signal parameters of the cable at each set monitoring point, and based on the temperature, humidity, magnetic field intensity, and electric field intensity of the environment where the signal generator and the cable are located at each set monitoring point, analyze the temperature correction index Tem j of the various signal parameters of the cable at each set monitoring point, the humidity correction index Humid j the magnetic field intensity correction index mag j and the electric field intensity correction index ele j , where j represents the number corresponding to the jth monitoring point, and j = 1, 2, 3,... J.

[0011] A signal parameter correction module: used to correct the various signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field intensity correction index, and electric field intensity correction index of the cable at each set monitoring point, and analyze the various signal parameters of the cable at each set monitoring point after the environmental parameters are corrected.

[0012] Deviation degree abnormal determination module: It is used to analyze the deviation degree index of each signal parameter of the cable based on each signal parameter of the cable at each set monitoring point after being corrected by each standard signal parameter and environmental parameter set by the signal generator, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

[0013] In a second aspect, the present invention provides a cable partial discharge calibration simulation method based on programmable technology. The method includes: S1. Signal parameter setting: Set each standard signal parameter through a signal generator, including the standard frequency, standard amplitude, standard pulse width, and standard pulse repetition frequency of the signal.

[0014] S2. Signal coupling and transmission: Generate a signal through a signal generator and couple and transmit the generated signal to the cable.

[0015] S3. Environmental parameter acquisition: Collect the temperature, humidity, magnetic field strength, and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point.

[0016] S4. Environmental parameter correction: Real-time monitor each signal parameter of the cable at each set monitoring point, and analyze the temperature correction index, humidity correction index, magnetic field strength correction index, and electric field strength correction index of each signal parameter of the cable at each set monitoring point based on the temperature, humidity, magnetic field strength, and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point.

[0017] S5. Signal parameter correction: Correct each signal parameter of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index, and electric field strength correction index of the cable at each set monitoring point, and analyze each signal parameter of the cable at each set monitoring point after environmental parameter correction.

[0018] S6. Deviation degree abnormal determination: Analyze the deviation degree index of each signal parameter of the cable based on each signal parameter of the cable at each set monitoring point after being corrected by each standard signal parameter and environmental parameter set by the signal generator, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By real-time monitoring each signal parameter of the cable at each set monitoring point and analyzing the temperature correction index, humidity correction index, magnetic field strength correction index, and electric field strength correction index of the cable at each set monitoring point based on the temperature, humidity, magnetic field strength, and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point, the present invention can effectively overcome the interference of environmental factors on signal transmission, keep the signal highly accurate and stable during the transmission process, reduce the possibility of signal distortion, attenuation, or distortion, and ensure the reliability of information transmission.

[0020] (2) The present invention corrects each signal parameter of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index, and electric field strength correction index of the cable at each set monitoring point, and analyzes each signal parameter of the cable at each set monitoring point after the environmental parameters are corrected. It can ensure that under different environmental conditions, each signal parameter is as close as possible to the ideal standard value, reduce signal distortion and errors, improve the fidelity of signal transmission, enable the receiving end to restore the original signal information more accurately, and greatly improve the quality and reliability of data transmission.

[0021] (3) The present invention analyzes the deviation degree index of each signal parameter of the cable by using each standard signal parameter set by the signal generator and each signal parameter of the cable at each set monitoring point after the environmental parameters are corrected, and then determines whether the deviation degree of each signal parameter of the cable is abnormal, and then performs calibration. It can accurately quantify the signal deviation situation, and based on this, calibration can be carried out to effectively correct the signal deviation caused by various factors and make the signal as close as possible to the ideal standard state. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the connection of each module of the system of the present invention.

[0024] Figure 2 It is a schematic diagram of the steps for the present invention to monitor the signal parameters of the cable at the set monitoring points in real time.

[0025] Figure 3 It is a schematic diagram of the steps of the method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figure 1As shown in the figure, the present invention provides a cable partial discharge calibration simulation system based on programmable technology, including: a signal parameter setting module, a signal coupling and transmission module, an environmental parameter acquisition module, an environmental parameter correction module, a signal parameter correction module, and a deviation degree abnormal determination module.

[0028] The signal coupling and transmission module is respectively connected to the signal parameter setting module and the environmental parameter acquisition module. The environmental parameter acquisition module is respectively connected to the signal coupling and transmission module and the environmental parameter correction module. The environmental parameter correction module is respectively connected to the environmental parameter acquisition module and the signal parameter correction module. The signal parameter correction module is respectively connected to the environmental parameter correction module and the deviation degree abnormal determination module.

[0029] The signal parameter setting module: is used to set various standard signal parameters through a signal generator, including the standard frequency, standard amplitude, standard pulse width, and standard pulse repetition frequency of the signal.

[0030] The signal coupling and transmission module: is used to generate a signal through a signal generator and couple and transmit the generated signal to the cable.

[0031] The environmental parameter acquisition module: is used to collect the temperature, humidity, magnetic field intensity, and electric field intensity of the environment where the signal generator and the cable are located at each set monitoring point.

[0032] By collecting the temperature, humidity, magnetic field intensity, and electric field intensity of the environment where the signal generator and the cable are located at each set monitoring point, the present invention can understand the environmental conditions of the signal generator in real time.

[0033] The environmental parameter correction module: is used to monitor in real time each signal parameter of the cable at each set monitoring point, and analyze the temperature correction index Tem j of each signal parameter of the cable at each set monitoring point based on the temperature, humidity, magnetic field intensity, and electric field intensity of the environment where the signal generator and the cable are located at each set monitoring point. j The humidity correction index Humid j The magnetic field intensity correction index mag j and the electric field intensity correction index ele

[0034] Please refer to Figure 2 As shown in the figure, the specific process of the real-time monitoring of each signal parameter of the cable at each set monitoring point is as follows: A1. Obtain the frequency of the signal of the cable at each monitoring point through a spectrum analyzer and record it as fre j .

[0035] As a preferred embodiment, the frequency of the signal of the cable at each monitoring point refers to the number of times the frequency of the signal of the cable at each monitoring point changes periodically per unit time.

[0036] For any periodic phenomenon, such as signals like sine waves and cosine waves, it represents the number of complete cycles the signal completes in one second. For example, if a sine wave signal completes 10 complete cycles in 1 second, then the frequency of this signal is 10 Hz (Hertz).

[0037] A2. Obtain the waveform of the signal of the cable at each monitoring point through an oscilloscope, and obtain the amplitude of the signal of the cable at each monitoring point from the height of the waveform of the signal of the cable at each monitoring point, and denote it as amp j 。

[0038] A3. By measuring the time difference between the starting point and the ending point of the pulse in the waveform of the signal of the cable at each monitoring point, obtain the pulse width of the signal of the cable at each monitoring point, and denote it as pulse j 。

[0039] A4. Calculate the period of the pulse through the time difference between two adjacent pulses in the waveform of the signal of the cable at each monitoring point. According to the relationship between frequency and period, calculate the pulse repetition frequency of the signal of the cable at each monitoring point, and denote it as repeat j 。

[0040] Specifically, the pulse repetition frequency of the signal of the cable at each monitoring point is: the number of times the pulse signal of the cable at each monitoring point repeats within a unit time.

[0041] For example, for a pulse radar platform that emits 100 pulse signals per second, then the pulse repetition frequency of this radar signal is 100 Hz. It describes the periodicity of the pulse sequence, and the reciprocal of the time interval between two adjacent pulses is the pulse repetition frequency.

[0042] Furthermore, the specific process of analyzing the temperature correction index of each signal parameter of the cable at the set monitoring points is: analyzing the temperature correction index Tem of the frequency of the signal of the cable at the set monitoring points j , where Xwen represents the temperature of the environment where the signal generator is located, Dwen j represents the temperature of the environment where the cable is located at the j-th set monitoring point, △T j represents the allowable temperature deviation value of the cable affected by temperature at the j-th set monitoring point, where α represents the temperature difference influence factor under the influence of temperature, and Bfre represents the standard frequency of the signal.

[0043] As a preferred embodiment, the specific setting process of α is as follows: In a laboratory environment, other environmental factors (such as humidity, magnetic field strength, and electric field strength) and the standard signal parameters of the signal generator need to be kept unchanged, and only the variable of temperature is changed. The cable is placed in different temperature environments. For each temperature value, the actual frequency of the signal transmitted by the cable at that temperature is measured, and at the same time, the temperature and standard frequency of the environment where the signal generator is located are recorded.

[0044] By using a data fitting method (such as the least squares method), based on the frequency data measured at different temperatures in the experiment, the relationship formula between frequency and temperature is determined. The experimental data is substituted into the relationship formula between frequency and temperature, a series of temperature difference influence factor values are calculated, and then the calculated temperature difference influence factor values are averaged to obtain the temperature difference influence factor under the influence of temperature.

[0045] Based on the temperature correction index of the frequency of the cable at each set monitoring point, similarly, the temperature correction indexes of the amplitude, pulse width, and pulse repetition frequency of the signal of the cable at each set monitoring point are obtained.

[0046] Further, the specific process of analyzing the humidity correction index of each signal parameter of the cable at each set monitoring point is as follows: The specific process of analyzing the humidity correction index of each signal parameter of the cable at each set monitoring point is as follows: Analyze the humidity correction index Humid of the amplitude of the signal of the cable at each set monitoring point j , where Bamp represents the standard amplitude of the signal, β represents the humidity difference influence factor under the influence of humidity, Xhum represents the humidity of the environment where the signal generator is located, and Dhum j represents the humidity of the environment where the cable is located at the jth set monitoring point.

[0047] The setting process of β is similar to that of α.

[0048] Based on the analysis method of the humidity correction index of the amplitude of the signal of the cable at each set monitoring point, similarly, the humidity correction indexes of the frequency, pulse width, and pulse repetition frequency of the signal of the cable at each set monitoring point are obtained.

[0049] The specific process of analyzing the magnetic field strength correction index of each signal parameter of the cable at each set monitoring point is as follows: Further, analyze the magnetic field strength correction index mag of the pulse width of the signal of the cable at each set monitoring point j , where Bpulse represents the standard pulse width of the signal, χ represents the magnetic field strength difference influence factor under the influence of magnetic field strength, Xmag represents the magnetic field strength of the environment where the signal generator is located, and Dmag j represents the magnetic field strength of the environment where the cable is located at the jth set monitoring point.

[0050] As a preferred embodiment, the χ * Bpulse * (Dmag j - Xmag) represents the change in the theoretical pulse width under the influence of the change in the magnetic field intensity at the set j-th monitoring point of the cable.

[0051] The setting process of the χ is similar to that of α.

[0052] Based on the analysis method of the magnetic field intensity correction index of the pulse width of the signals at the set monitoring points of the cable, the magnetic field intensity correction indexes of the frequency, amplitude, and pulse repetition frequency of the signals at the set monitoring points of the cable are obtained in the same way.

[0053] Further, the specific process of analyzing the electric field intensity correction index of each signal parameter at the set monitoring points of the cable is as follows: Analyze the electric field intensity correction index ele of the pulse repetition frequency of the signals at the set monitoring points of the cable j , where Brepeat represents the standard pulse repetition frequency of the signal, δ represents the electric field intensity difference influence factor under the influence of the electric field intensity, Xele represents the electric field intensity of the environment where the signal generator is located, and Dele j represents the electric field intensity of the environment where the cable is located at the set j-th monitoring point.

[0054] As a preferred embodiment, the Brepeat * δ * (Dele j - Xele) represents the change in the theoretical pulse repetition frequency under the influence of the change in the electric field intensity at the set j-th monitoring point of the cable.

[0055] The setting process of the δ is similar to that of α.

[0056] Based on the analysis method of the electric field intensity correction index of the pulse repetition frequency of the signals at the set monitoring points of the cable, the electric field intensity correction indexes of the frequency, amplitude, and pulse width of the signals at the set monitoring points of the cable are obtained in the same way.

[0057] By real-time monitoring of each signal parameter of the cable at the set monitoring points, and based on the temperature, humidity, magnetic field intensity, and electric field intensity of the environment where the signal generator and the cable are located at the set monitoring points, the temperature correction index, humidity correction index, magnetic field intensity correction index, and electric field intensity correction index of the cable at the set monitoring points are analyzed, which can effectively overcome the interference of environmental factors on signal transmission, keep the signal highly accurate and stable during the transmission process, reduce the possibility of signal distortion, attenuation, or distortion, and ensure the reliability of information transmission.

[0058] Signal parameter correction module: It is used to correct each signal parameter of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index, and electric field strength correction index of the cable at each set monitoring point, and analyze each signal parameter of the cable at each set monitoring point after the environmental parameters are corrected.

[0059] Further, the specific process of analyzing each signal parameter of the cable at each set monitoring point after the environmental parameters are corrected is as follows: Analyze the frequency Xfre of the signal of the cable at each set monitoring point after the environmental parameters are corrected. j , where χ 1 、χ 2 、χ 3 and χ 4 respectively represent the weights corresponding to the temperature correction index, humidity correction index, magnetic field strength correction index, and electric field strength correction index of the cable at the set monitoring point, and χ 1 +χ 2 +χ 3 +χ 4 =1.

[0060] As a preferred embodiment, the χ 1 、χ 2 、χ 3 and χ 4 can be set to 0.4, 0.2, 0.2, and 0.2 respectively. The influence of temperature on cable signal transmission is usually more significant. The electrical properties (such as resistivity, etc.) of many materials will change with the change of temperature, which directly affects the signal transmission characteristics; humidity mainly affects signal transmission by affecting the electrical properties such as the dielectric constant of insulating materials. High humidity may cause the insulation performance of the cable to decline, resulting in signal leakage, etc., but this kind of influence is generally smaller than the influence of temperature. In most cases, the change of humidity on the signal frequency is relatively indirect and slow; the influence of magnetic field on the cable signal frequency depends on whether the cable is of a type vulnerable to magnetic field interference (such as a cable with poor shielding). In the actual environment, generally, the change of magnetic field strength is relatively small, and not all cables will be strongly interfered by the magnetic field. Only in the case of being close to a strong magnetic field source (such as a large motor, transformer, etc.), the interference of the magnetic field on the cable signal will be more obvious; similar to the magnetic field strength, the influence of the electric field on the cable signal frequency also requires specific conditions. Generally, the change of the surrounding electric field strength will not affect the cable signal frequency as generally as the change of temperature. Only when there is a strong electric field interference source (such as near a high-voltage transmission line), the influence of the electric field on the cable signal will be more significant. Therefore, the weight corresponding to the temperature correction index of the cable at the set monitoring point is greater than the weights corresponding to the humidity correction index, magnetic field strength correction index, and electric field strength correction index.

[0061] The analysis method of the frequency of the signals of the cable corrected according to the environmental parameters at each set monitoring point. Similarly, the amplitudes, pulse widths, and pulse repetition frequencies of the signals of the cable corrected according to the environmental parameters are obtained, and are denoted as Xamp j , Xpulse j and Xrepeat j .

[0062] In the present invention, by correcting each signal parameter of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index, and electric field strength correction index of the cable at each set monitoring point, and analyzing each signal parameter of the cable corrected according to the environmental parameters, it can be ensured that under different environmental conditions, each signal parameter is as close as possible to the ideal standard value, reducing signal distortion and error, improving the fidelity of signal transmission, enabling the receiving end to more accurately restore the original signal information, and greatly improving the quality and reliability of data transmission.

[0063] Deviation degree abnormal determination module: used to analyze the deviation degree index of each signal parameter of the cable based on each standard signal parameter set by the signal generator and each signal parameter of the cable corrected according to the environmental parameters at each set monitoring point, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

[0064] Further, the specific process of determining whether the deviation degree of each signal parameter of the cable is abnormal is: analyzing the deviation degree index Pfre of the frequency of the signal of the cable, where J represents the total number of monitoring points, and e represents the natural constant.

[0065] According to the analysis method of the deviation degree index of the frequency of the signal of the cable, similarly, the deviation degree indexes of the amplitude, pulse width, and pulse repetition frequency of the signal of the cable are obtained, and are denoted as Pamp, Ppulse, and Prepeat respectively.

[0066] Compare the deviation degree indexes of each signal parameter of the cable with the preset deviation degree index threshold. If the deviation degree index of a certain signal parameter of the cable is greater than the preset deviation degree index threshold, then the deviation degree of the signal parameter of the cable is abnormal, and then the signal parameters with abnormal deviation degree of the cable are obtained.

[0067] Further, the specific process of performing calibration is: if a certain signal parameter with abnormal deviation degree of the cable is frequency, then adjust the output frequency of the signal generator until the frequency of the cable at each set monitoring point reaches the frequency of the corresponding monitoring point of the cable corrected according to the environmental parameters.

[0068] Similarly, in accordance with the analysis method where a certain signal parameter with abnormal deviation degree of the cable is frequency, calibrations are performed for the cases where a certain signal parameter with abnormal deviation degree of the cable is amplitude, pulse width, and pulse repetition frequency.

[0069] Through the signal parameters of each standard set by the signal generator and the signal parameters of the cable at each set monitoring point after environmental parameter correction, the deviation degree index of each signal parameter of the cable is analyzed. Furthermore, it is determined whether the deviation degree of each signal parameter of the cable is abnormal, and then calibration is carried out. This can accurately quantify the signal deviation situation. Based on this for calibration, it can effectively correct the signal deviation caused by various factors and make the signal as close as possible to the ideal standard state.

[0070] Please refer to Figure 3 As shown, the second aspect of the present invention provides a cable partial discharge calibration simulation method based on programmable technology. The method includes: S1. Signal parameter setting: Set each standard signal parameter through a signal generator, including the standard frequency, standard amplitude, standard pulse width, and standard pulse repetition frequency of the signal.

[0071] S2. Signal coupling and transmission: Generate a signal through the signal generator and couple and transmit the generated signal to the cable.

[0072] S3. Environmental parameter acquisition: Acquire the temperature, humidity, magnetic field strength, and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point.

[0073] S4. Environmental parameter correction: Real-time monitor the signal parameters of the cable at each set monitoring point. Based on the temperature, humidity, magnetic field strength, and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point, analyze the temperature correction index, humidity correction index, magnetic field strength correction index, and electric field strength correction index of the signal parameters of the cable at each set monitoring point.

[0074] S5. Signal parameter correction: Correct the signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index, and electric field strength correction index of the cable at each set monitoring point, and analyze the signal parameters of the cable at each set monitoring point after environmental parameter correction.

[0075] S6. Deviation degree abnormal determination: Based on the signal parameters of each standard set by the signal generator and the signal parameters of the cable at each set monitoring point after environmental parameter correction, analyze the deviation degree index of each signal parameter of the cable, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

[0076] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications, supplements, or use similar methods to replace the specific embodiments described. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A cable partial discharge calibration simulation system based on programmable technology, characterized by: include: Signal parameter setting module: used to set various standard signal parameters through the signal generator, including the standard frequency, standard amplitude, standard pulse width and standard pulse repetition frequency of the signal; Signal coupling and transmission module: used to generate a signal through a signal generator and couple and transmit the generated signal to the cable; Environmental parameter acquisition module: used to collect the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point; Environmental parameter correction module: used to monitor the signal parameters of the cable at each set monitoring point in real time, and analyze the temperature correction index Tem of each signal parameter of the cable at each set monitoring point based on the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point j , Humidity Correction Index j , Magnetic field strength correction index mag j and the electric field strength correction index ele j , where j represents the number corresponding to the jth monitoring point, j = 1, 2, 3, ... J; The specific process of analyzing the temperature correction index of each signal parameter of the cable at each set monitoring point is as follows: Analyze the temperature correction index Tem of the signal frequency of the cable at each set monitoring point j , Where Xwen represents the temperature of the environment where the signal generator is located, Dwen j Indicates the temperature of the environment where the cable is located at the set jth monitoring point, ΔT j It indicates the allowable temperature deviation value of the cable affected by the temperature at the set jth monitoring point. Where α represents the temperature difference factor under the influence of temperature, Bfre represents the standard frequency of the signal, fre j Indicates the frequency of the signal of the cable at each monitoring point; Based on the temperature correction index of the frequency of the cable at each set monitoring point, the temperature correction index of the amplitude, pulse width and pulse repetition frequency of the signal of the cable at each set monitoring point is obtained similarly; Signal parameter correction module: used to correct the signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point, and analyze the signal parameters of the cable at each set monitoring point after the environmental parameter correction; Deviation degree abnormality judgment module: used to analyze the deviation degree index of each signal parameter of the cable based on each signal parameter of the cable at each set monitoring point and each signal parameter of the cable at each set monitoring point after correction of environmental parameters, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

2. The cable partial discharge calibration simulation system based on programmable technology according to claim 1, characterized in that: The specific process of real-time monitoring of the signal parameters of the cable at each set monitoring point is as follows: A1. Obtain the frequency of the signal at each monitoring point through the spectrum analyzer and record it as fre j ; A2. Obtain the waveform of the cable signal at each monitoring point through an oscilloscope, and obtain the amplitude of the cable signal at each monitoring point through the height of the waveform of the cable signal at each monitoring point, which is recorded as amp j ; A3. By measuring the time difference between the starting point and the ending point of the pulse in the waveform of the cable signal at each monitoring point, the pulse width of the cable signal at each monitoring point is obtained and recorded as pulse j ; A4. Calculate the pulse period by the time difference between two adjacent pulses in the waveform of the signal of the cable at each monitoring point. Calculate the pulse repetition frequency of the signal of the cable at each monitoring point based on the relationship between frequency and period, and record it as repeat j .

3. The cable partial discharge calibration simulation system based on programmable technology according to claim 2, characterized in that: The specific process of analyzing the humidity correction index of each signal parameter of the cable at each set monitoring point is as follows: Analyze the humidity correction index Humid of the signal amplitude of the cable at each set monitoring point j , Where Bamp represents the standard amplitude of the signal, β represents the humidity difference factor under the influence of humidity, Xhum represents the humidity of the environment where the signal generator is located, and Dhum j Indicates the humidity of the environment where the cable is located at the set jth monitoring point; Based on the analysis method of the humidity correction index of the amplitude of the cable signal at each set monitoring point, the humidity correction index of the frequency, pulse width and pulse repetition frequency of the cable signal at each set monitoring point is obtained similarly.

4. The cable partial discharge calibration simulation system based on programmable technology according to claim 2, characterized in that: The specific process of analyzing the magnetic field strength correction index of each signal parameter of the cable at each set monitoring point is as follows: Analyze the magnetic field strength correction index mag of the pulse width of the cable signal at each set monitoring point j , Where Bpulse represents the standard pulse width of the signal, χ represents the influence factor of the magnetic field strength difference under the influence of the magnetic field strength, Xmag represents the magnetic field strength of the environment where the signal generator is located, and Dmag j It represents the magnetic field strength of the environment where the cable is located at the set jth monitoring point; Based on the analysis method of the magnetic field strength correction index of the pulse width of the cable signal at each set monitoring point, the magnetic field strength correction index of the frequency, amplitude and pulse repetition frequency of the cable signal at each set monitoring point is obtained similarly.

5. The cable partial discharge calibration simulation system based on programmable technology according to claim 2, characterized in that: The specific process of analyzing the electric field strength correction index of each signal parameter of the cable at each set monitoring point is as follows: Analyze the electric field strength correction index ele of the pulse repetition frequency of the signal of the cable at each set monitoring point j , Where Brepeat represents the standard pulse repetition frequency of the signal, δ represents the influence factor of the electric field strength difference under the influence of the electric field strength, Xele represents the electric field strength of the environment where the signal generator is located, and Dele j It represents the electric field strength of the environment where the cable is located at the set jth monitoring point; Based on the analysis method of the electric field strength correction index of the pulse repetition frequency of the cable signal at each set monitoring point, the electric field strength correction index of the frequency, amplitude and pulse width of the cable signal at each set monitoring point is obtained similarly.

6. The cable partial discharge calibration simulation system based on programmable technology according to claim 2, characterized in that: The specific process of analyzing the signal parameters of the cable at each set monitoring point after the environmental parameter correction is as follows: Analyze the frequency Xfre of the cable signal at each set monitoring point after the environmental parameter correction j , Wherein χ1, χ2, χ3 and χ4 represent the weights corresponding to the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at the set monitoring point, respectively, and χ1+χ2+χ3+χ4=1; According to the analysis method of the frequency of the signal of the cable at each set monitoring point after the environmental parameters are corrected, the amplitude, pulse width and pulse repetition frequency of the signal of the cable at each set monitoring point after the environmental parameters are corrected are obtained in the same way, which are recorded as Xamp j 、Xpulse j and Xrepeat j .

7. The cable partial discharge calibration simulation system based on programmable technology according to claim 6 is characterized by: The specific process of determining whether the deviation degree of each signal parameter of the cable is abnormal is as follows: Analyze the frequency deviation index Pfre of the cable signal. Where J represents the total number of monitoring points, and e represents a natural constant; According to the analysis method of the frequency deviation index of the cable signal, the deviation index of the amplitude, pulse width and pulse repetition frequency of the cable signal is obtained in the same way, which are recorded as Pamp, Ppulse and Prepeat respectively; The deviation degree index of each signal parameter of the cable is compared with the preset deviation degree index threshold. If the deviation degree index of a signal parameter of the cable is greater than the preset deviation degree index threshold, the deviation degree of the signal parameter of the cable is abnormal, and then the signal parameters of the cable with abnormal deviation degree are obtained.

8. The cable partial discharge calibration simulation system based on programmable technology according to claim 7, characterized in that: The specific process of calibration is as follows: If a signal parameter of the cable with abnormal deviation is frequency, the output frequency of the signal generator is adjusted until the frequency of the cable at each set monitoring point reaches the frequency of the monitoring point corresponding to the cable after the environmental parameter correction; Similarly, according to the analysis method in which a certain signal parameter of the abnormal cable deviation degree is frequency, the case in which a certain signal parameter of the abnormal cable deviation degree is amplitude, pulse width and pulse repetition frequency is calibrated.

9. The cable partial discharge calibration simulation system based on programmable technology according to claim 1, characterized in that: The simulation methods of this system include: S1. Signal parameter setting: setting various standard signal parameters through the signal generator, including the standard frequency, standard amplitude, standard pulse width and standard pulse repetition frequency of the signal; S2, signal coupling transmission: Generate a signal through a signal generator, and couple the generated signal to the cable; S3, environmental parameter collection: collect the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point; S4, environmental parameter correction: real-time monitoring of the signal parameters of the cable at each set monitoring point, based on the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point, analyzing the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the signal parameters of the cable at each set monitoring point; S5, signal parameter correction: correcting the signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point, and analyzing the signal parameters of the cable at each set monitoring point after the environmental parameter correction; S6. Determination of abnormal deviation degree: Based on the signal parameters of the cable at each set monitoring point after correction of the standard signal parameters and environmental parameters set by the signal generator, analyze the deviation degree index of each signal parameter of the cable, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

Images